I don't tend to go out my way to show great gestures to unknown parties such as giving away concert tickets, but I do tend to let people go in front of me when getting on buses, or letting them have my seats. I did randomly buy donuts for my team at work because I was off for the next 4 days and they weren't.

Edit: Oh I do remember. Last week after walking Shauna to work while I had the day off I saw an older lady trying to walk up some steps with a trolley. I helped her up the stairs and carried her bags!